Hi there! Today we are going to code one of the very basic requirement of a PHP web app – a PHP login script. This PHP login script tutorial also covers the log-out script. We are going to manage these tasks with the help of PHP sessions. A PHP session consists of a way to preserve certain data that can be used across different pages or section of your website.

Our code for today will do the following:

Show user a login form (login.php) and validate the inputs when the “Login” button was clicked. It will either say “Access Denied” if the login failed, or else, be redirected to the index page (main page of your web app, index.php).

When the user is not yet logged in and tried to go to the index page directly via pasting the URL, he will be redirected to the login page with a message “You cannot go to the index page because you are not yet logged in.”

When the user is already logged in and tried to go to the login page, he will be redirected to the index page and tell him “You cannot go to login page because you are already logged in.”

login.php – will show the login form where the user can enter his username and password. Please note that we didn’t use a database to get and match the entered username and password since we are just taking a look on how a PHP login script works. If you want to integrate this with a database, this is a nice start: PDO read records.

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